79th United States Congress
Senate

State (class)
Vacator
Reason for change
Successor
Date of successor's formal installation
Washington (1)
Monrad Wallgren (D)
Resigned January 9, 1945, after being elected Governor of Washington. Successor was appointed to serve until the next election.
Hugh Mitchell (D)
January 10, 1945
Connecticut (1)
Francis T. Maloney (D)
Died January 16, 1945. Successor was appointed to serve until a special election.
Thomas C. Hart (R)
February 15, 1945
Missouri (1)
Harry S. Truman (D)
Resigned January 17, 1945, after being elected Vice President of the United States. Successor was appointed to serve until the next election.
Frank P. Briggs (D)
January 18, 1945
North Dakota (3)
John Moses (D)
Died March 3, 1945. Successor was appointed to serve until a special election, which he subsequently won.
Milton Young (R)
March 12, 1945
Nevada (1)
James G. Scrugham (D)
Died June 23, 1945. Successor was appointed to serve until the next election.
Edward P. Carville (D)
July 25, 1945
California (1)
Hiram Johnson (R)
Died August 6, 1945. Successor was appointed to serve until a special election, which he subsequently won.
William F. Knowland (R)
August 26, 1945
Ohio (1)
Harold H. Burton (R)
Resigned September 30, 1945, after being appointed an Associate Justice of the Supreme Court of the United States. Successor was appointed to serve until a special election.
James W. Huffman (D)
October 8, 1945
Kentucky (2)
Happy Chandler (D)
Resigned November 1, 1945, after becoming Commissioner of Major League Baseball. Successor was appointed to serve until a special election.
William A. Stanfill (R)
November 19, 1945
Idaho (2)
John W. Thomas (R)
Died November 10, 1945. Successor was appointed to serve until a special election, which he subsequently lost.
Charles C. Gossett (D)
November 17, 1945
Virginia (2)
Carter Glass (D)
Died May 28, 1946. Successor was appointed to serve until a special election.
Thomas G. Burch (D)
May 31, 1946
Alabama (2)
John H. Bankhead II (D)
Died June 12, 1946. Successor was appointed to serve until a special election.
George R. Swift (D)
June 15, 1946
Vermont (1)
Warren Austin (R)
Resigned August 2, 1946, after being appointed United States representative on the United Nations Security Council. Successor was appointed to serve until the next election.
Ralph Flanders (R)
November 1, 1946
Florida (1)
Charles O. Andrews (D)
Died September 18, 1946. Successor was elected to finish term.
Spessard Holland (D)
September 25, 1946
Alabama (2)
George R. Swift (D)
Resigned November 5, 1946. Successor was elected to finish term.
John Sparkman (D)
November 6, 1946
Connecticut (1)
Thomas C. Hart (R)
Resigned November 5, 1946. Successor was elected to finish term.
Raymond E. Baldwin (R)
December 27, 1946
Kentucky (2)
William A. Stanfill (R)
Resigned November 5, 1946. Successor was elected to finish term
John S. Cooper (R)
November 6, 1946
Ohio (1)
James W. Huffman (D)
Resigned November 5, 1946. Successor was elected to finish term.
Kingsley A. Taft (R)
November 6, 1946
Virginia (2)
Thomas G. Burch (D)
Resigned November 5, 1946. Successor was elected to finish term.
Absalom W. Robertson (D)
November 6, 1946
Idaho (2)
Charles C. Gossett (D)
Resigned November 6, 1946. Successor was elected to finish term.
Henry Dworshak (R)
November 6, 1946
North Carolina (2)
Josiah Bailey (D)
Died December 15, 1946. Successor was appointed to serve until a special election, which he subsequently lost.
William B. Umstead (D)
December 18, 1946
Washington (1)
Hugh Mitchell (D)
Resigned December 25, 1946. Successor was appointed to finish the term already having to be elected the next term.
Harry P. Cain (R)
December 26, 1946

Question: How did the membership change in the senate of the 79th United States Congress (Washington state)?
Answer: Senator in the 79th United States Congress (Washington state), Monrad Wallgren (D), was until January 9, 1945 then Hugh Mitchell (D), from January 10, 1945 till December 25, 1946 and Harry P. Cain (R), from December 26, 1946.